发明名称 |
Coordinate inputting apparatus and signal transmitting system thereof |
摘要 |
A coordinate inputting apparatus has a separating circuit (1), a cable (2) and a position indicating pen (3). The separating circuit (1) has a low pass filter (4) for removing an alternating current component from a signal transmitted to a signal line (2a) and a band pass filter (5) for passing only a position information signal in a predetermined frequency band with respect to the signal transmitted to the signal line (2a). The cable (2) is constructed by the signal line (2a), a switching signal line (SW) and a ground line (GND). The signal line (2a) is used to supply power to the position indicating pen (3) and transmit a detecting signal from the position indicating pen (3) to each of an X-coordinate detecting circuit (30) and a Y-coordinate detecting circuit (31). The position indicating pen (3) has a low pass filter (7) and a band pass filter (8). A signal transmitting system of this coordinate inputting apparatus and other coordinate inputting apparatuses are also shown. <IMAGE> |
申请公布号 |
EP0681259(B1) |
申请公布日期 |
2001.07.25 |
申请号 |
EP19950105663 |
申请日期 |
1995.04.13 |
申请人 |
SHARP KABUSHIKI KAISHA |
发明人 |
IGUCHI, SHIGEKI;HIRANO, KATSUMI;NISHIMURA, TOMOHIKO;HIROMOTO, KUNIO;NOMIYA, KAZUYOSHI |
分类号 |
G06F3/0354;G06F3/041;(IPC1-7):G06K11/18;G06K11/16 |
主分类号 |
G06F3/0354 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|